The sum of a number and –9 is 3. Find the number.?

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The sum of a number and –9 is 3. Find the number.?

2007-08-12 17:17:06 · 5 answers · asked by hplover1430 2 in Science & Mathematics ➔ Mathematics

5 answers

x + (-9) = 3
x - 9 = 3
x = 12

2007-08-12 21:54:19 · answer #1 · answered by Como 7 · 1⤊ 1⤋

2007-08-13 00:32:22 · answer #2 · answered by AJ 2 · 0⤊ 0⤋

2007-08-13 00:23:58 · answer #3 · answered by Peter 2 · 0⤊ 0⤋

the equation is x+(-9)=3

when you add a negative number, it's the same as subtracting so

x-9=3

add 9 to each side, in order to undo the -9

x=12

check to make sure

12 - 9 = 3

2007-08-13 00:27:57 · answer #4 · answered by Erenrei 2 · 0⤊ 0⤋

Answer is 12

2007-08-13 00:24:12 · answer #5 · answered by D@ R-ti$t 2 · 0⤊ 0⤋